ExtJs、Struts2、Hibernate3.2的Grid后台分页

1、大致思想模型

 

2、基本配置

2.1、创建数据库test，表student、mark

DROP TABLE IF EXISTS `test`.`student`;
CREATE TABLE `test`.`student` (
`stuid` varchar ( 20 ) NOT NULL ,
`stuname` varchar ( 20 ) NOT NULL ,
`stusex` varchar ( 20 ) NOT NULL ,
`stuaddress` varchar ( 20 ) NOT NULL ,
PRIMARY KEY (`stuid`)
) ENGINE = InnoDB DEFAULT CHARSET = utf8;

DROP TABLE IF EXISTS `test`.`mark`;
CREATE TABLE `test`.`mark` (
`stuid` varchar ( 20 ) DEFAULT NULL ,
`stumath` int ( 11 ) NOT NULL ,
`stuchinese` int ( 11 ) NOT NULL ,
`stuenglish` int ( 11 ) NOT NULL ,
KEY `stuid` (`stuid`),
CONSTRAINT `stuid` FOREIGN KEY (`stuid`) REFERENCES `student` (`stuid`)
) ENGINE = InnoDB DEFAULT CHARSET = utf8;

 

2.2、配置hibernate

项目->点击右键->MyEclipse->Add Hibernate Capabilities...

 

2.3、配置hibernate.cfg.xml文件（如编码方式、sql在tomcat运行的显示）

<? xml version='1.0' encoding='UTF-8' ?>
<! DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >

<!-- Generated by MyEclipse Hibernate Tools. -->
< hibernate-configuration >

< session-factory >
< property name ="connection.username" > root </ property >
< property name ="connection.url" >
jdbc:mysql://localhost:3306
</ property >
< property name ="dialect" >
org.hibernate.dialect.MySQLDialect
</ property >
< property name ="myeclipse.connection.profile" > mysql </ property >
< property name ="connection.password" > 123 </ property >
< property name ="connection.driver_class" >
com.mysql.jdbc.Driver
</ property >
<!-- 数据库方面的sql语句的显示，可省略 -->
< property name ="current_session_context_class" > thread </ property >
< property name ="show_sql" > true </ property >
< property name ="format_sql" > true </ property >
<!-- 数据库存储方面的字符串格式，不可省略，使传送到数据库的编码是utf-8格式 -->
< property name ="connection.useUnicode" > true </ property >
< property name ="connection.characterEncoding" > UTF-8 </ property >
</ session-factory >

</ hibernate-configuration >

 

2.4、配置struts2，加入基本包和sturts.xml

commons-fileupload-1.2.1.jar

commons-io-1.3.2.jar

freemarker-2.3.16.jar

javassist-3.7.ga.jar

ognl-3.0.jar

struts2-core-2.2.1.jar

xwork-core-2.2.1.jar

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd" >

< struts >
<!-- Add packages here -->
</ struts >

 

2.5、配置web.xml（与struts2的交互）

 

<? xml version="1.0" encoding="UTF-8" ?>
< web-app version ="2.5" xmlns ="http://java.sun.com/xml/ns/javaee"
xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation ="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
< filter >
< filter-name > struts2 </ filter-name >
< filter-class >
org.apache.struts2.dispatcher.FilterDispatcher
</ filter-class >
</ filter >
< filter-mapping >
< filter-name > struts2 </ filter-name >
< url-pattern > /* </ url-pattern >
</ filter-mapping >
< welcome-file-list >
< welcome-file > index.jsp </ welcome-file >
</ welcome-file-list >
</ web-app >

 

2.6、配置ExtJs

官网下载:http://www.sencha.com/products/js/

 

3、创建数据库持久层PO

（见源码）

 

4、创建数据库访问层DAO

4.1、创建DAO接口

package DAO;

import java.util.List;

public interface IStudentmarkDAO {
public List QueryAll( int start, int limit);
public int FindAllRows();
}

4.2、创建DAO实现类

package DAO;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;

import HbmFactory.HibernateSessionFactory;

public class StudentmarkDAOImpl implements IStudentmarkDAO {
public List QueryAll( int start, int limit) {
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
String sql = " select new map(p.stuid as stuid,p.stuname as stuname,p.stusex as stusex,p.stuaddress as stuaddress, "
+ " q.stumath as stumath,q.stuchinese as stuchinese,q.stuenglish as stuenglish) from Student p,Mark q where p.stuid=q.stuid " ;

Query query = session.createQuery(sql);
session.getTransaction().commit();
if (query != null ) {
return query.setFirstResult(start).setMaxResults(limit).list();
}
return null ;
}

public int FindAllRows() {
Session session = HibernateSessionFactory.getSession();
session.beginTransaction();
String sql = " select new map(p.stuid as stuid,p.stuname as stuname,p.stusex as stusex,p.stuaddress as stuaddress, "
+ " q.stumath as stumath,q.stuchinese as stuchinese,q.stuenglish as stuenglish) from Student p,Mark q where p.stuid=q.stuid " ;

Query query = session.createQuery(sql);
session.getTransaction().commit();
if (query != null ) {
return query.list().size();
}
return 0 ;
}
}

 

5、创建业务服务层Service

 

5.1、创建Service的Action控制器接口

package Service;

public interface IActionService {
public String execute() throws Exception;
}

5.2、创建Service实现类

 

package Service;

import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

import org.apache.struts2.ServletActionContext;

import DAO. * ;

public class StudentmarkServiceImpl implements IActionService {
private IStudentmarkDAO studentmark = new StudentmarkDAOImpl();
private int start;
private int limit;

public int getStart() {
return start;
}

public void setStart( int start) {
this .start = start;
}

public int getLimit() {
return limit;
}

public void setLimit( int limit) {
this .limit = limit;
}

public String execute() throws Exception {
HttpServletResponse response = ServletActionContext.getResponse();

// 编制响应的格式
response.setContentType( " text/html;charset=UTF-8 " );

JSONArray json = JSONArray.fromObject(studentmark.QueryAll(getStart(),
getLimit()));
response.getWriter().write(
" {\ " totalCount\ " : " + studentmark.FindAllRows() + " ,\ " data\ " : "
+ json.toString() + " } " );
return null ;
}

}

6、创建Action业务控制器

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd" >

< struts >

< package name ="Service" extends ="struts-default" >
<!-- 配置Action -->
< action name ="showdata" class ="Service.StudentmarkServiceImpl" ></ action >
</ package >

<!-- Add packages here -->
</ struts >

 

7、运行效果图

 

 

 

8、总结

这里用了json-lib进行json序列化，hibernate中外键用了map的映射方法，即此处HQL是“select new map(...) ...”，对map有个初步的了解；

大致了解了sturts和hibernate的模型，为之后课程设计做好了一定的准备工作；

 

9、以下是相关配置和使用环境

win7系统

myeclipse6.5

tomcat6.0版本

extjs3.2版本

struts2.2.1

hibernate3.2

mysql5.1

json-lib

 

10、下载相关

因为源代码没有加入Extjs，所以这部分添加麻烦读者自己到它们的官方网站下载了。

Extjs官方下载包：http://www.sencha.com/products/js/

struts配置：http://files.cnblogs.com/yongfeng/Struts.rar

json-lib包：http://files.cnblogs.com/yongfeng/json-lib.rar

MyEclipse配置手册（包含tomcat6.0）：http://files.cnblogs.com/yongfeng/%e6%93%8d%e4%bd%9c%e6%89%8b%e5%86%8c_MyEclipse.rar

源代码下载：http://dl.dbank.com/c09kdeh84y（缺少数据库和ExtJs）